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I have a small, hard, white-colored bump on the underside of my penis...what is it?

About a month or so ago, I noticed a small, hard, white-colored bump on the underside of the penis at the base (about where the scrotum and penis meet). I thought it might be an STD, but it didn’t hurt or itch, so I figured I would just "wait and see." I got tested for HIV and syphilis, and am awaiting results. But now the bump is bigger, bullet-shaped, and somewhat painful and itchy. Any idea what it might it be?